Ground-state of graphene in the presence of random charged impurities

Details Ground-state of graphene in the presence of random charged impurities Ground-state of graphene in the presence of random charged impurities

2008-03-06

arxiv.org/abs/0803.0963v2

Phys. Rev. Lett. 101, 166803 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.166803

We calculate the carrier density dependent ground state properties of graphene in the presence of random charged impurities in the substrate taking into account disorder and interaction effects non-perturbatively on an equal footing in a self-consistent theoretical formalism. We provide detailed quantitative results on the dependence of the disorder-induced spatially inhomogeneous two-dimensional carrier density distribution on the external gate bias, the impurity density, and the impurity location. We find that the interplay between disorder and interaction is strong, particularly at lower impurity densities. We show that for the currently available typical graphene samples, inhomogeneity dominates graphene physics at low ($\lesssim 10^{12}$ cm$^{-2}$) carrier density with the density fluctuations becoming larger than the average density.

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